diff --git a/preparation.md b/preparation.md
index 27e5663..2f27650 100644
--- a/preparation.md
+++ b/preparation.md
@@ -28,7 +28,12 @@ My tool doesn't really care, which program created the gpx-file, as long as it f
 I got used to [GPS Logger](https://play.google.com/store/apps/details?id=com.mendhak.gpslogger) on Android. It seems to be free.
 To get precise locations for your photos, there have to be datapoints in the recording close to the time the picture was taken. But I don't want to stress the phone's battery too much. So I went with an interval of 5s and a distance of 5m between two datapoints. And I keep the GPS locked during the time it records.
 
-![App energy saving][android_app_engerysave]
-![Disable energy saving][android_app_exception]
+![GPS Logger erformance][gpslogger_performance]
+![GPS Logger distance][gpslogger_distance]
+![GPS Logger interval][gpslogger_interval]
+
+[gpslogger_performance]: images/gpslogger_performance.png
+[gpslogger_distance]: images/gpslogger_distance.png
+[gpslogger_interval]: images/gpslogger_interval.png
 
 ## Geigercounter